fix(macos): prevent Talk Mode audio hang

apps/macos/Tests/ClawdisIPCTests/TalkAudioPlayerTests.swift

@@ -0,0 +1,79 @@
+import Foundation
+import Testing
+@testable import Clawdis
+
+@Suite(.serialized) struct TalkAudioPlayerTests {
+    @MainActor
+    @Test func playDoesNotHangWhenPlaybackEndsOrFails() async throws {
+        let wav = makeWav16Mono(sampleRate: 8000, samples: 80)
+        defer { _ = TalkAudioPlayer.shared.stop() }
+
+        _ = try await withTimeout(seconds: 2.0) {
+            await TalkAudioPlayer.shared.play(data: wav)
+        }
+
+        #expect(true)
+    }
+}
+
+private struct TimeoutError: Error {}
+
+private func withTimeout<T: Sendable>(
+    seconds: Double,
+    _ work: @escaping @Sendable () async throws -> T) async throws -> T
+{
+    try await withThrowingTaskGroup(of: T.self) { group in
+        group.addTask {
+            try await work()
+        }
+        group.addTask {
+            try await Task.sleep(nanoseconds: UInt64(seconds * 1_000_000_000))
+            throw TimeoutError()
+        }
+        let result = try await group.next()
+        group.cancelAll()
+        guard let result else { throw TimeoutError() }
+        return result
+    }
+}
+
+private func makeWav16Mono(sampleRate: UInt32, samples: Int) -> Data {
+    let channels: UInt16 = 1
+    let bitsPerSample: UInt16 = 16
+    let blockAlign = channels * (bitsPerSample / 8)
+    let byteRate = sampleRate * UInt32(blockAlign)
+    let dataSize = UInt32(samples) * UInt32(blockAlign)
+
+    var data = Data()
+    data.append(contentsOf: [0x52, 0x49, 0x46, 0x46]) // RIFF
+    data.appendLEUInt32(36 + dataSize)
+    data.append(contentsOf: [0x57, 0x41, 0x56, 0x45]) // WAVE
+
+    data.append(contentsOf: [0x66, 0x6D, 0x74, 0x20]) // fmt
+    data.appendLEUInt32(16) // PCM
+    data.appendLEUInt16(1) // audioFormat
+    data.appendLEUInt16(channels)
+    data.appendLEUInt32(sampleRate)
+    data.appendLEUInt32(byteRate)
+    data.appendLEUInt16(blockAlign)
+    data.appendLEUInt16(bitsPerSample)
+
+    data.append(contentsOf: [0x64, 0x61, 0x74, 0x61]) // data
+    data.appendLEUInt32(dataSize)
+
+    // Silence samples.
+    data.append(Data(repeating: 0, count: Int(dataSize)))
+    return data
+}
+
+private extension Data {
+    mutating func appendLEUInt16(_ value: UInt16) {
+        var v = value.littleEndian
+        Swift.withUnsafeBytes(of: &v) { append(contentsOf: $0) }
+    }
+
+    mutating func appendLEUInt32(_ value: UInt32) {
+        var v = value.littleEndian
+        Swift.withUnsafeBytes(of: &v) { append(contentsOf: $0) }
+    }
+}